多元合金多晶粒的枝晶生长非等温相场模拟.pdfVIP

学兔兔 铸 造 May 2009 ·462· FOUNDRY VoI．58 NO．5 多元合金多晶粒的枝晶生长非等温相场模拟 冯 力 ，王智平 ．一，路 阳 ，朱昌盛’，肖荣振 (1．兰州理_T-大学材料科学与工程学院，甘肃兰州730050； 2．甘肃省有色金属及复合材料工程技术研究中心，甘肃兰州730050) 摘要：基于多元合金多晶粒生长的等温相场模型，耦合温度场，发展一个新的非等温枝晶生长相场模型。利用该模 型，以A1．Cu-Mg 元合金为例，模拟多元合金凝固过程中多个晶粒枝晶生长过程。结果表明，该型计算结果展现了多 个晶粒枝晶的竞争生长，能较真实再现凝固过程中的枝晶生长过程；展示凝固潜热的释放；在枝晶中，先凝固部分温 度要低于后凝固部分；过冷度越大，凝固速度越快。 关键词：相场法；多晶粒；非等温凝固；多元合金；模拟 中图分类号：TG248；TG113．12 文献标识码：A 文章编号：1001—4977(2009)05—0462—04 Phase．Field ModeI of Non．IsothermaI Dendritic Gro、^，Ih Of Multicomponent Alloy with Multiple Grains FENG Li’，WANG Zhi—ping 一，LU Yang’，ZHU Chang-sheng’，XlAO Rong-zhen’ (1．College of Materials Science and Engineering，Lanzhou Univ．of Tech．，Lanzhou 730050， Gansu．China；2．Engineering Technology Research Centre of Gansu Nonferrous＆Composite Materials，Lanzhou 730050，Gansu，China) Abstract：A new phase—field model of dendritic growth of non．isothermaI solidification js developed based on the phase-field modeI of isothermaI solidification of multicomponent alloy with multiple grains，In connection with the temperature field．Taking AI．Cu-Mg alloy for example。the dendritic growth process of multiple grains during multicomponent alloy solidification was simulated．The simulation results show dendritic competitive growth of multiple grains，and reproduced the process of dendrite growth in practical solidification．The release of Iatent heat during the solidification of the alloy was present in simulation．1n the same grain．the temperature of the region solidified earlier iS Iess than the region of Iater solidif